Histograms are not bell curves - this is not statistics 101 - this is photography
This is important because there is no histogram shape that you need to aim for when shooting - no perfect shape to the light of the graph that will get good results. Each situation will be different - the key is learning to read the histogram enough to understand what it is telling you.
And they are easy to use too - the right side shows full under exposure - areas of your photo where nothing but pure black and no details are recorded. Whilst the right is full overexposure - bright white where (again) no detail is recorded. Inbetween those two points you have the spread of the light through the shot and (depending on the scene) this can be full of complex peeks and troughs or not. In some cases you might even get several separate peeks with no link between them.
A "correct" exposure when reading the histogram in an ideal situation is one here you have no bars hitting the far left hand side and also have the majority of the bulb of the light over as far to the right as possible. In editing you can always darken selective areas if you want; but if you have the opposite (ie key areas you have to brighten) then you will start introducing noise into those areas as you add light in editing.
To help with this histograms also have gridlines, where each line represents one full stop - so if you're one stop underexposed (ie you have a full stops distance between the brightest point of data and the far right hand side) then you can use settings for a second shot which allows for letting in one more stop of light (slower shutter speed; wider aperture; higher ISO). Of course sometimes you won't want to do this - you might need a faster shutter speed for action or your ISO and aperture might already be at their limits. So its important to temper the idea of perfect histogram exposure with remembering the limits at the time due to light and also due to artistic need (since sometimes you'll want to go against the grain to get the artistic representation you want).
EDIT _ as for the photos if you want to learn the first and best step is to first do two things:
1) When shooting pause and think - think about what you want the photo to show and also how you want to show this. Time, experience, practice and messing around and making mistakes will help you a lot in speeding up and getting to grips with this.
2) Don't just post photos and expect others to think. Doing so leaves you at the whim of the wind - instead ground yourself first. Learn to look at your photos with a critical eye and don't just think about the problems - write them down (that forces you to organise and put structure to your thoughts). In addition self criticism in a thread can help you learn as others can pitch in on your own views - pointing out where you might be overthinking on minor points or where you might be overlooking the bigger picture.
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